./ntp_test_client [ntp server ip]
Default ip is "182.92.12.11". It's ntp1.aliyun.com
For example:
$ ./ntp_test_client 182.92.12.11
send to ip: 182.92.12.11
local Transmit Timestamp: 2018-05-25 05:52:32.816965 2023B2DE-449E24D1
Remote NTP time
Reference Timestamp -- : 2018-05-25 05:51:52.816965 F822B2DE-449E24D1
Originate Timestamp(T1): 2018-05-25 05:52:32.816965 2023B2DE-449E24D1
Receive Timestamp (T2): 2018-05-25 05:52:32.828075 2023B2DE-A9B4FCD3
Transmit Timestamp (T3): 2018-05-25 05:52:32.828095 2023B2DE-FD04FED3
Loacl receive time(T4): 2018-05-25 05:52:32.846380
Offset time form NTP-server to local ((T2-T1)+(T3-T4))/2: = -3587us
Synced time = 2018-05-25 05:52:32.842793
recvfrom() = 48. Data is [OK]
exit